Friday

April 29, 2016
Posted by **Adria** on Tuesday, December 8, 2009 at 8:57am.

A. 40

B. 100

C. 75

D. 90

- Statistics -
**Reiny**, Tuesday, December 8, 2009 at 9:58amAccording to

http://davidmlane.com/hyperstat/z_table.html

the probability of a time greater than 13 minutes is .00135

None of your choices result from that probability. - Statistics -
**PsyDAG**, Tuesday, December 8, 2009 at 10:06amZ = (x - μ)/SD

Z = (13-7)/2 = 6/2 = 3

Look up this Z in a table in the back of your statistics text covering areas under the normal distribution for the smallest area. Multiply this value by 400.

Unfortunately, that does not fit any of your choices. Do you have any typos? - Statistics -
**Adria**, Tuesday, December 8, 2009 at 12:51pmNo. No typos. That's how its written on the packet I am doing. Thank You so much for your help though, I guess my teacher might've made a typo...

- Statistics -
**Tofik**, Sunday, April 24, 2016 at 4:59pmThe result of an exam score for a given class is normally distributed. If the mean score is

85 points and the standard deviation is equal to 20 points, find the cutoff passing grade

such that 83.4% of those taking the test will pass - Statistics -
**Tofik**, Sunday, April 24, 2016 at 5:01pmThe manager of a hotel has stated that the mean guest bill for a weekend is Birr 400 or

less. A member of the hotel’s accounting staff has noticed that the total charges for guest

bills have been increasing in recent months. The accountant will use a sample of weekend

guest bills to test the manager’s claim.

Required: State the null and alternative hypotheses - Statistics -
**Tofik**, Sunday, April 24, 2016 at 5:03pmA manager wishes to find out whether there is a relationship between the number of radio

advertisement aired per week and the amount of sales (in hundreds of Birr) of a product.

The data for the sample are given below.

Number of Advertisement (X) 2 5 8 8 10 12

Sales (Y) 2 4 7 6 9 10

Compute the value of the correlation coefficient and explain the degree of relationship - Correlation cofficient and degree of relationship -
**Tofik**, Sunday, April 24, 2016 at 5:06pmA manager wishes to find out whether there is a relationship between the number of radio

advertisement aired per week and the amount of sales (in hundreds of Birr) of a product.

The data for the sample are given below.

Number of Advertisement (X) 2 5 8 8 10 12

Sales (Y) 2 4 7 6 9 10

Compute the value of the correlation coefficient and explain the degree of relationship